Control circuit using IC, 3-terminal capacitor, and components in a power supply device

Abstract

A control circuit formed on a PCB includes an IC, a 3-terminal capacitor, and a first component. The IC has a structure where four or more terminals are arranged on one side of the IC, the 3-terminal capacitor includes a feedthrough electrode and a reference electrode, and the first component has one end and another end. The first wire is wired in a direction along the one side of the IC. The 3-terminal capacitor is configured such that one end of the feedthrough electrode is connected to any terminal of the IC, and such that the reference electrode is connected to the first wire. The one end of the first component is connected to any terminal of the IC, and the first component straddles the first wire or connects the first wire to the other end.

What is claimed is: 
     
       1. A control circuit formed on a printed circuit board (PCB), the control circuit comprising:
 an integrated circuit (IC); 
 a 3-terminal capacitor; 
 a first component; and 
 a second component, 
 wherein the IC has a structure, such that four or more terminals are arranged on one side of the IC, 
 the 3-terminal capacitor includes a feedthrough electrode and a reference electrode, 
 the first component has one end and another end, 
 the 3-terminal capacitor and the first component are surface-mount components, 
 the PCB includes a first wire, 
 the first wire is wired in a direction along the one side of the IC, 
 the 3-terminal capacitor is configured such that:
 one end of the feedthrough electrode is connected to any terminal of the four or more terminals of the IC, and 
 the reference electrode is connected to the first wire, 
 
 the one end of the first component is connected to any terminal of the four or more terminals of the IC, 
 the other end of the first component is connected to the first wire, 
 the first wire is a power supply wire or a ground (GND) wire connected to the IC, 
 the control circuit is formed on either a front surface of the PCB or a back surface of the PCB, 
 the 3-terminal capacitor and the first component are disposed on the PCB within a range of 10 times of a length of a longer side of the 3-terminal capacitor from the one side of the IC, 
 the second component has one end and another end, 
 the one end of the second component is connected to any other terminal of the four or more terminals of the IC, and 
 the second component straddles the first wire. 
 
     
     
       2. A power supply device comprising the control circuit according to  claim 1 .